Performance and carcass traits of Nellore and Red Norte steers finished in feedlot

Neto, Otávio Rodrigues Machado; Ladeira, Márcio Machado; Gonçalves, Tarcisio de Moraes; Lopes, Leandro Sâmia; Oliveira, De; Lima, Renato Ribeiro de

doi:10.1590/s1516-35982011000500020

Cited by 3 publications

(2 citation statements)

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“…A eficiência alimentar também foi influenciada pelos grupos genéticos (P<0,05). Os animais Red foram superiores aos Nelore (0,18 vs 0,13 respectivamente) (Machado Neto et al, 2011). De modo geral, o cruzamento entre animais de raças europeias e zebuínas resulta em animais com maior peso de abate, quando terminados com dieta de elevado teor energético.…”

Section: Resultsunclassified

Características de carcaça e cortes comerciais de tourinhos Red Norte e Nelore terminados em confinamento

et al. 2012

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RESUMO -Nellore animals were slaughtered at 519 and 482 kg, respectively. The subcutaneous fat thickness (FT) and longissimus muscle area (LMA) were measured between 12th and 13th ribs. Higher carcass yield of the Nellore breed was observed (57.7 vs 54.7%).However, there was no difference for weight of hot and cold carcass between the groups. Red Norte animals showed greater LMA, and hindquarter and spare ribs with higher weight and yield, and forequarter with lower weight and yielding. The Red Norte genetic group showed higher weight for cap and rump and striploin, while Nellore showed higher weight for shoulder and flatround. Nellore animals had better carcass yield, which contributes to hot carcass weight. Nevertheless, the group Red Norte have higher hindquarter yield and more weight from cuts of highest commercial value.Key Words: longissimus muscle area, slaughter, slaughterhouse freezer IntroduçãoA pecuária brasileira é baseada na rusticidade e fertilidade das raças zebuínas e ainda apresenta médias zootécnicas baixas para os padrões atuais. O aumento da competitividade com outras fontes de proteína animal, bem como outros mercados concorrentes, e a possibilidade de o Brasil se consolidar ainda mais no mercado mundial de carne bovina tem requerido da atividade pecuária de corte a oferta de produto de qualidade de maneira contínua durante todo o ano (Resende et al., 2010). Um dos grandes desafios da cadeia produtiva da carne bovina é produzir carne que atenda às expectativas dos diversos mercados consumidores, cujo grau de exigência tem se elevado de

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Section: Resultsunclassified

Características de carcaça e cortes comerciais de tourinhos Red Norte e Nelore terminados em confinamento

et al. 2012

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“…Some studies were carried out in Brazil to quantify the consumption of food by Bos taurus, Bos indicus animals and their crossbreed (MARCONDES et al, 2008;MACHADO NETO et al, 2011;RIBEIRO et al, 2012). A difference in the food consumption by taurine and zebu animals kept in confinement was evidenced by Almeida and Lanna (2003) and Machado Neto et al (2011), who found lower values of consumption by zebu than taurine animals. Thus, it is important to verify within each system of beef cattle production which nutritional system makes the most accurate and precise predictions of consumption.…”

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Dry matter intake observed and predicted by the nutritional systems NRC and BR-Corte for feedlot nelore heifers fed with human feed products

Silva

Faria

Cunha

et al. 2019

SCA

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We aimed to evaluate the effects of using a concentrated ration containing industrialised human food on the productive parameters of Nellore heifers in confinement, in addition to comparing the dry matter intake (DMI) observed with that predicted by the nutritional systems BR-Corte and NRC, in order to determine which system makes the most accurate predictions for heifers of the breed Nelore in feedlots. Twenty-four Nelore heifers, with an average age of 24 months and average body weight (BW) of 350 kg, were used over the 70 days of the experiment. They were randomly assigned to two treatments and housed in partially covered stalls equipped with an automatic Growsafe® Systems feeding system. Animals in the control group (CONT) received a concentrated ration containing ground corn, soybean meal, urea, and mineral nucleus. In the residual treatment (RES) group, heifers received concentrated feed containing products from the human diet. The difference between the treatments was the concentrated ration; in the control treatment, the energy source used was maize, whereas in the residue treatment, the energy sources were corn chips, coconut candies, and ground coffee. Corn silage was included as forage for both treatments. The forage:concentrate (F:C) ratio was 84:16. The predicted intake was estimated according to the nutritional systems NRC (2000, 2016) and BR-Corte (VALADARES FILHO et al., 2010, 2016). The average DMI observed of the heifers was 7.46 kg day-1. Heifers fed with human feed residue had a higher dry matter intake (DMI) and higher ether extract intake (EEI) than animals fed with the control feed. In addition, heifers that received human feed products showed a lower average daily weight gain (DWG) of 1.08 kg day-1 than animals fed the control treatment with an average DWG of 1.24 kg day-1. The predicted dry matter intake by NRC 2000 was an overestimate by 9.78 % and by BR-Corte 2010 was an overestimate by 5.5 %. The NRC 2016 and BR-Corte 2016 underestimated the intake of heifers by 18.9 % and 7.1 %, respectively. It was concluded that growing Nelore heifers fed with human feed products, with a F:C ratio of 84:16, present a higher DMI and lower growth performance and feed efficiency than heifers fed the control diet. The DMI predicting models for Nellore heifers proposed by BR-Corte are more adequate than the NRC models.

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Nitrogen metabolism and protein requirements for maintenance of growing Red Norte bulls

Amorim

Silva

Ladeira

et al. 2020

Animal

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Dietary protein adjustments can reduce environmental impact and economic losses in production systems. However, we lack information regarding nitrogen (N) metabolism and protein requirements for maintenance of crossbred animals such as Red Norte breed, precluding a precise dietary management. The objective was to evaluate the effect of increasing dietary CP levels (9%, 11%, 13%, 15% and 17%) on intake, digestibility and N balance, as well as to estimate the metabolizable protein requirements for maintenance (MPm) of growing Red Norte bulls. Thirty five animals averaging 280 ± 4.0 kg BW were fed during 45 days in a 60 : 40 forage : concentrate ratio diet in which the last 5 days were used for the digestibility trial. Intakes of CP and non-fibrous carbohydrates (NFCs) and feed efficiency linearly increased (P < 0.05) as CP levels increased, while DM, NDF, nitrogen efficiency use and ether extract were not influenced by CP levels (P > 0.05). Digestibilities of DM, organic matter, ether extract, NFC and CP as well as metabolizable energy intake linearly increased (P < 0.05), and true digestibility of CP was not affected (P > 0.05) by treatments. Urinary N and retained N linearly increased (P < 0.05) with the increase in dietary N. The MPm were estimated as 4.46 g/BW0.75 and the efficiency of use of MPm was 0.673. In conclusion, obtained MPm requirements of growing Red Norte bulls are greater than the values reported in literature for Zebu cattle and dietary CP levels of 15% and 17% exhibited great responses for growing Red Norte cattle. However, a cost-benefit evaluation should be done before its use.

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Performance and carcass traits of Nellore and Red Norte steers finished in feedlot

Cited by 3 publications

References 21 publications

Características de carcaça e cortes comerciais de tourinhos Red Norte e Nelore terminados em confinamento

Características de carcaça e cortes comerciais de tourinhos Red Norte e Nelore terminados em confinamento

Dry matter intake observed and predicted by the nutritional systems NRC and BR-Corte for feedlot nelore heifers fed with human feed products

Nitrogen metabolism and protein requirements for maintenance of growing Red Norte bulls

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